Determinant of a 4x4 Matrix - Check my answer please?

  • Thread starter Tanarif
  • Start date
  • #1
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Homework Statement


Hey guys, I usually have no trouble with 3x3 matrices, and for a 4x4 I've a rough idea how to do it but not entirely sure if I did it correct. I've attached my attempt below with working out.

The matrix:

[itex]\begin{pmatrix} 0 & 2 & 0 & 0 \\7 & a+1 & 3 & a+1 \\1 & 0 & 2 & 0 \\ a & 1 & a-2 & 0 \end{pmatrix}[/itex]

2. The attempt at a solution

My working out, question 6a here:
oad8bo.jpg


And the answer I got is: [itex] 2a^2 + 6a + 4 [/itex]

Could anyone give me a quick hand as to whether that looks right / if not, how to go about doing it? Cheers
 

Answers and Replies

  • #3
Your method and solution looks correct.
 

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